Transcription and translation can be coupled in bacteria but not eukaryotes because

Question

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In bacteria (prokaryotes), the lack of a nuclear membrane allows transcription and translation to occur simultaneously, as the mRNA being transcribed from DNA can immediately be translated by ribosomes. In contrast, eukaryotes have a nuclear membrane that separates transcription (in the nucleus) from translation (in the cytoplasm), preventing their coupling.

Transcription and Translation Can Be Coupled in Bacteria but Not